NetworkCalc

About NetworkCalc

NetworkCalc provides a REST API offering networking and developer utilities, with endpoints returning JSON responses over HTTPS. Public endpoints, which require no account, cover binary base conversion, DNS record lookups (including WHOIS and SPF), text encoding/decoding (URL, Base64, Base64URL), website/domain security details such as TLS certificates, and subnet calculations from an IP or CIDR address, including masks, binary representations, and assignable addresses.

A separate set of account-level endpoints requires an authorization token or signed-in session, covering account authorization, custom alerts for monitoring network resources, domain and subdomain management, scheduled or on-demand reports, and management of saved subnets. Documentation includes parameters, response formats, and examples for cURL, PowerShell, and Python, with an interactive command tester available for testing calls directly. The API is actively maintained but does not carry a formal uptime SLA.

This service is suited for developers building tools or automation around DNS resolution, IP subnetting, encoding tasks, or domain/security monitoring, ranging from simple stateless lookups to authenticated account-based monitoring workflows.

Key features

• Subnet calculator returns masks, binary representations, and assignable addresses
• DNS Tools resolves DNS, WHOIS, and SPF records for a hostname
• Encoder supports URL, Base64, and Base64URL encoding/decoding
• Security Tools retrieves TLS certificate and other security details for a domain
• Domains and Subnets APIs let authorized accounts manage and monitor resources
• Alerts API supports custom monitoring alerts on network resources

Frequently asked questions